CN101879599B - Method for preparing reductive iron powder and high-purity refined iron powder by using iron ores - Google Patents
Method for preparing reductive iron powder and high-purity refined iron powder by using iron ores Download PDFInfo
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Abstract
The invention discloses a method for preparing reductive iron powder and high-purity refined iron powder by using iron ores. The method comprises the following steps of: ore crushing, dry grinding for preparing powder, reducing agent preparation, uniform mixing of pellet materials, pellet preparation, pellet roasting, water quenching, grinding and classification, magnetic separation, product dehydration and drying and the like so as to obtain the high-purity refined iron powder. The method has the advantages of simple process, wide application range and strong operability; the products are diversified, and the reductive iron powder and the high-purity refined iron powder can be obtained; the waste gas is reclaimed for recycling, the tailings are used as raw materials for slag cement and the tail water is used in a closed cycle mode, so the method belongs to an environment-friendly process; and the products have stable quality. The method is particularly adaptive to chlorination and reduction of the iron ores with characteristics of thin disseminated grain size, complex ore composition, high impurity (sulfur, phosphorus, arsenic and silicon) content and the like.
Description
Technical field
The invention belongs to technical field of mineral processing, specifically a kind ofly prepare the smart powder method of reduced iron powder and high purity iron with iron ore chlorination reduction-fine grinding magnetic separation.
Background technology
Along with developing rapidly of China's steel and iron industry, the demand of iron ore is the trend of being growing on and on changes.The iron ore ubiquity iron content of China is low, contain assorted high, ore forms characteristics such as complicated, that the ore disseminated grain size is thin, the refractory iron ore that traditional beneficiation method is handled the type is more difficult to get desirable iron ore concentrate, product is single, is difficult to satisfy the demand of different smelting iron and steel factories and relevant enterprise.
Ore dressing to iron ore at present mainly contains magnetic separation process, gravity separation technology, magnetizing roast technology, direct reducing process, because the ore nature difference is bigger, is difficult to obtain a kind of desirable iron ore treatment process.Along with developing rapidly of steel and iron industry industry, reduce the cost of smelting iron and steel, it is comparatively crucial how effectively to carry out preliminary treatment before smelting, improve the iron grade of iron ore concentrate to greatest extent, reduce the content of harmful element in the iron ore concentrate, minimizing improves the smelting equipment life-span to the corrosion of smelting equipment, can effectively reduce smelting cost like this.
Existing related known technology: " a kind of high-phosphorus iron ore chlorination reduction-low intensity magnetic separation method for reducing phosphorus patent of invention " of (1) application number: 200810233764.X, relate to a kind of high-phosphorus iron ore chlorination reduction-low intensity magnetic separation method for reducing phosphorus, adopt chlorination reduction-weak magnetic separation process to realize that carrying iron falls phosphorus, to carrying out the chlorination reduction roasting at roaster behind high-phosphorus iron ore adding chlorinating agent and the reducing agent coke mixing, product after the roasting is through shrend, sort with low-intensity (magnetic) separator behind the ball milling, can obtain iron grade＞80%, iron recovery＞85%, the iron ore concentrate of phosphorous＜0.20% can be directly as the raw material of smelting the pig iron behind this fine iron breeze process pelletizing.In addition, at bloodstone, the hematite-limonite of while sulfur-bearing or while sulfur-bearing and arsenic, high-phosphorus iron ores such as roe shape hematite-limonite, bloodstone, siderite, the sulfur content that equally also can obtain in the iron ore concentrate is lower than 0.20%, and arsenic content is lower than 0.04% product.(2) application number: 94101498.3 patent of invention " production method of sponge iron ", the raw material that adopts is the smart powder of iron oxide ore or iron, the fuel, reducing agent, the desulfurizing agent that adopt are respectively raw coal, anthracite, lime, the retort that adopts is a clay matter fire-resistant can, after various batchings are pulverized and mixed, be pressed into tinning behind the little briquet, a plurality of retort are put into reduction furnace and are heated, remove surperficial carbon deposit after the product piece is come out of the stove and be sponge iron, this product can be steel quality raw materials is provided.(3) application number is 200610151186.6 patent of invention " method for producing direct reduction iron by hybrid process ", relate to a kind of method for producing direct reduction iron by hybrid process, iron oxide fine powder and reducing agent are mixed in proportion uniformly, be encased in the fire-resistant slot device of U type, close the lid or seal up fire clay, be placed on the chassis, send in the kiln and reduce.When the present invention makes iron oxide fine powder reduction reaction, be heated evenly, reduction reaction completely, DRI content improves, improve DRI metal conversion ratio, the quality of DRI is improved, shortened the time of reduction reaction, its production efficiency is improved, reduced integrated cost.(4) application number: 200710185249.4 patent of invention " utilizes various iron ores to produce the technology of reduced iron ", relates to a kind of reduced iron production technology, is specially a kind of technology of utilizing various iron ores to produce reduced iron.Solved and existed most red lean ores can not be directly used in the problem that reduced iron is produced in the prior art.Ore reduction, forming ingredient, oven dry, roasting 3～5 hours under 1000～1230 degrees centigrade condition then, the abrasive material magnetic separation of cooling back obtains reduced iron powder, oven dry, moulding.The ore scope of using is the particulate bloodstone, limonite, and roe shape ore deposit, iron-holder 28%～55%, sulfur content are less than 0.3%, and phosphorus content is less than 0.3%.
The deficiency that above prior art exists mainly shows as:
(1) accommodation is not too extensive
(2) product that obtains is comparatively single
(3) the interpolation medicament kind is many, and the practical operation difficulty increases
(4) production cycle is long
Summary of the invention
The object of the invention provides that a kind of technology is simple, applied widely, workable, constant product quality prepare reduced iron powder and the smart powder method of high purity iron with iron ore chlorination reduction-fine grinding magnetic separation.
China's iron ore ubiquity iron content is low, and it is higher to contain assorted (sulphur, phosphorus, arsenic, silicon), and ore is formed characteristics such as complexity.Iron ore resource for exploitation China preciousness, adopt chlorination reduction-fine grinding magnetic separation process directly to prepare reduced iron powder and the smart powder of high purity iron, break traditional iron ore and handled the situation of having to the smart powder product of single iron, started the new situation that domestic refractory iron ore directly prepares reduced iron powder and the smart powder of high purity iron.
The present invention is directed to various types of iron ores adopts chlorination reduction-fine grinding magnetic separation process to prepare reduced iron powder and high purity iron essence powder is divided into following steps:
(1) the ore reduction stage: adopt disintegrating machine with crushing raw ore to-below the 20mm, insert in the drying plant dryly, bake out temperature is 400 ℃, the control free moisture is less than 5%;
(2) the dry grinding powder process stage: adopt the ore materials after the oven dry below the Raymond mill general-20mm to dry grind to the powdery sample of granularity less than 0.154mm (100 order);
(3) reducing agent preparatory phase: adopt Raymond mill that coke is dry grinded to granularity and be-1mm;
(4) the pelletizing material mixing stage: with the calcium chloride (graininess) of the mass fraction 20%～40% of ore, 10%～25% coke and-the abundant mixing pelletizing of 0.154mm epipastic mineral material;
(5) the pelletizing stage: adopt pelletizer pelletizing material (mixture of calcium chloride, coke and ore) to be prepared into-pellet of 25+10mm, and pellet is inserted in the drying plant, bake out temperature is 400 ℃, and the free moisture of control pellet is less than 5%;
(6) the roasting stage: free moisture inserted less than 5% pellet carry out roasting in the roaster, 900 ℃～1100 ℃ of sintering temperatures, roasting time 45～90min;
(7) the shrend stage: insert water quenching pool by the pellet after the roaster roasting and carry out shrend, contact generation oxidative phenomena with oxygen for preventing iron in air, the control aerial time of staying of material was less than 15 seconds;
(8) the grind grading stage: adopt ball mill that the shrend material is carried out ore grinding, cooperate classifying equipoment, control mog-0.038mm accounts for more than 95%;
(9) the magnetic separation stage: adopt magnetic field intensity H
1It is-the thin ore deposit of 0.038mm to obtain magnetic product I and non-magnetic product I that the magnetic separator of=0.05～0.10T sorts granularity; Adopt magnetic field intensity H
2The magnetic separator of=0.20～0.30T sorts non-magnetic product I (mine tailing of a stages of magnetic separation is specifically seen accompanying drawing 1) and obtains magnetic product II and non-magnetic product I I;
(10) the product dewatered drying stage: adopt dewatered drying equipment that magnetic product I is carried out dewatered drying and obtain reduced iron powder, magnetic product II is carried out drying and dewatering obtain the smart powder of high purity iron, non-magnetic product I I is carried out drying and dewatering obtain mine tailing (as the raw material of slag cements).
Compared with prior art, method of the present invention has realized being difficult to the direct production reduced iron that utilizes of multiple red lean ore (di-iron trioxide) that enrichment utilizes originally, and in all fields to raw material, as iron content, on the harmful element content requirement such as sulphur phosphorus very big relaxing arranged, for the utilization of red ore deposit and other difficult ore dressing provides a wide approach.
The present invention's following characteristics of having compared with existing known technology:
(1) technology is simple, and is applied widely, workable;
(2) product diversification can get the smart powder of reduced iron powder and high purity iron;
(3) waste gas recycle and reuse, mine tailing all are closed cycle utilizations as raw material, the tail water of slag cements, belong to environment friendly technology;
(4) constant product quality.
The special adaptation of method of the present invention is thin with disseminated grain size, ore is formed complicated, as to contain characteristics such as assorted (sulphur, phosphorus, arsenic, silicon) height iron ore chlorination reduction.
Description of drawings
Fig. 1 is that iron ore chlorination of the present invention is reduced a fine grinding magnetic separation and prepared the smart powder craft flow process of high purity iron.
The specific embodiment
Embodiment one:
Sample ore is from the Huimin Prefecture, Yunnan, and the raw ore iron content belongs to weathering particulate hematite-limonite 42～48%.Ore reduction inserted in the drying plant after less than 20mm to granularity dry, 400 ℃ of bake out temperatures, the control free moisture is less than 5%; Adopt the Raymond mill dry grinding to-100 purpose powdery samples on the sample after the oven dry, add the CaCl of the mass fraction 30% of dry ore
2, 15% coke (granularity-1mm), with powdery sample mixing, sample pelletizing after adopting pelletizer with mixing is to the pellet of-20+10mm, pellet is inserted drying plant, dry to free moisture less than 5%, 400 ℃ of bake out temperatures, pelletizing sample after the oven dry is transported to and carries out the chlorination reduction roasting in the roaster, 1000 ℃ of sintering temperatures, roasting time 60min, mog-0.038mm accounts for 95%, carry out two stages of magnetic separation then, a stages of magnetic separation magnetic field intensity H
1=0.08T, two stages of magnetic separation H
2=0.20T, the flow process mineral processing index sees Table 1.
Table 1 flow process mineral processing index
| Product | Productive rate (%) | Iron grade (%) | Iron recovery (%) |
| Reduced iron powder | 21.46 | 92.68 | 43.98 |
| The smart powder of high purity iron | 25.36 | 74.52 | 41.78 |
| Mine tailing | 53.18 | 12.11 | 14.24 |
| Add up to | 100.00 | 45.23 | 100.00 |
Embodiment two:
Sample ore is from the somewhere, Sichuan, raw ore iron content 32～43%, and ore is formed comparatively complicated, and disseminated grain size is quite thin.Ore reduction inserted in the drying plant after less than 20mm to granularity dry, 400 ℃ of bake out temperatures, the control free moisture is less than 5%; Adopt the Raymond mill dry grinding to-100 purpose powdery samples on the sample after the oven dry, add the CaCl of the mass fraction 40% of dry ore
2, 25% coke (granularity-1mm), with powdery sample mixing, sample pelletizing after adopting pelletizer with mixing is to the pellet of-20+10mm, pellet is inserted drying plant, dry to free moisture less than 5%, 400 ℃ of bake out temperatures, the pelletizing sample after the oven dry is transported to the roasting of emanating in the roaster, 950 ℃ of sintering temperatures, roasting time 90min, mog-0.038mm account for 95%, one stages of magnetic separation magnetic field intensity H
1=0.10T, two stages of magnetic separation magnetic field intensity H
2=0.30T, the flow process mineral processing index sees Table 2.
Table 2 flow process mineral processing index
| Product | Productive rate (%) | Iron grade (%) | Iron recovery (%) |
| Reduced iron powder | 16.63 | 91.56 | 41.51 |
| The smart powder of high purity iron | 21.04 | 73.11 | 41.94 |
| Mine tailing | 62.33 | 9.74 | 16.55 |
| Add up to | 100.00 | 36.68 | 100.00 |
Embodiment three:
Sample ore is from the somewhere, Guangxi, and raw ore iron content about 48～53% belongs to typical limonite ore.Ore reduction inserted in the drying plant after less than 20mm to granularity dry, 400 ℃ of bake out temperatures, the control free moisture is less than 5%; Adopt the Raymond mill dry grinding to-100 purpose powdery samples on the sample after the oven dry, add the CaCl of the mass fraction 10% of dry ore
2, 10% coke (granularity-1mm), with powdery sample mixing, sample pelletizing after adopting pelletizer with mixing is to the pellet of-20+10mm, pellet is inserted drying plant, dry to free moisture less than 5%, 400 ℃ of bake out temperatures, the pelletizing sample after the oven dry is transported to the roasting of emanating in the roaster, 1100 ℃ of sintering temperatures, roasting time 45min, mog-0.038mm account for 95%, one stages of magnetic separation magnetic field intensity H
1=0.07T, two stages of magnetic separation magnetic field intensity H
2=0.20T, the flow process mineral processing index sees Table 3.
Table 3 flow process mineral processing index
| Product | Productive rate (%) | Iron grade (%) | Iron recovery (%) |
| Reduced iron powder | 23.68 | 94.53 | 44.16 |
| The smart powder of high purity iron | 28.11 | 75.23 | 41.72 |
| Mine tailing | 48.21 | 14.85 | 14.12 |
| Add up to | 100.00 | 50.69 | 100.00 |
Embodiment four:
Sample ore is from the somewhere, Shaanxi, and raw ore iron content about 36～45% belongs to typical weathering particulate siderite, has a spot of hematite-limonite to account for 10% simultaneously.Ore reduction inserted in the drying plant after less than 20mm to granularity dry, 400 ℃ of bake out temperatures, the control free moisture is less than 5%; Adopt the Raymond mill dry grinding to-100 purpose powdery samples on the sample after the oven dry, add the CaCl of the mass fraction 35% of dry ore
2, 20% coke (granularity-1mm), with powdery sample mixing, sample pelletizing after adopting pelletizer with mixing is to the pellet of-20+10mm, pellet is inserted drying plant, dry to free moisture less than 5%, 400 ℃ of bake out temperatures, the pelletizing sample after the oven dry are transported to and carry out the chlorination reduction roasting in the roaster, 900 ℃ of sintering temperatures, roasting time 75min, mog-0.038mm account for 95%, one stages of magnetic separation magnetic field intensity H
1=0.06T, two stages of magnetic separation magnetic field intensity H
2=0.25T, the flow process mineral processing index sees Table 4.
Table 4 flow process mineral processing index
| Product | Productive rate (%) | Iron grade (%) | Iron recovery (%) |
| Reduced iron powder | 20.11 | 90.05 | 42.97 |
| The smart powder of high purity iron | 23.27 | 72.45 | 40.00 |
| Mine tailing | 56.62 | 12.68 | 17.03 |
| Add up to | 100.00 | 42.15 | 100.00 |
By specific embodiment as can be seen, this invention directly prepares the smart powder of high purity iron at iron ore obvious effects, mainly shows the following aspects:
(1) at dissimilar iron ores, chlorination reduction-fine grinding magnetic separation process is adopted in this invention, and the adjusting process parameter can obtain iron grade 〉=90.05%, the reduced iron powder product index of iron recovery 〉=41.51%; Can obtain iron grade 〉=72.45%, the smart powder product index of iron recovery 〉=40.00% high purity iron.
(2) compare with existing known technology, roasting time is short, can reduce the production cycle greatly, effectively improves the disposal ability of unit equipment, reduces production costs, and increases economic efficiency.
(3) product diversity can satisfy the demand of different smelting iron and steel factory to raw materials for metallurgy.
(4) this invention has that technological process is short, environmental pollution is little, the product quality advantages of higher.This invention provides new approaches for the development and use of iron ore undoubtedly, has improved for a long time to the difficult situation that directly obtains reduced iron powder and high-purity iron powder product simultaneously of refractory iron ore.
Claims (1)
1. one kind prepares the smart powder method of reduced iron powder and high purity iron with iron ore, it is characterized in that carrying out according to the following steps:
(1) the ore reduction stage: iron ore is crushed to below the 20mm, oven dry, bake out temperature is 400 ℃, the control free moisture is less than 5%;
(2) the dry grinding powder process stage: the ore materials after the oven dry below the 20mm is dry grinded to the epipastic mineral of granularity less than 0.154mm;
(3) reducing agent preparatory phase: coke dry grinded to granularity is-1mm;
(4) the pelletizing material mixing stage: with the calcium chloride of iron ore mass fraction 20%～40%, 10%～25% coke and-the abundant mixing of epipastic mineral of 0.154mm gets the pelletizing material;
(5) the pelletizing stage: the pelletizing material is prepared into-pellet of 25-+10mm, and pellet is inserted in the drying plant, bake out temperature is 400 ℃, and the free moisture of control pellet is less than 5%;
(6) the roasting stage: free moisture inserted less than 5% pellet carry out roasting in the roaster, 900 ℃～1100 ℃ of sintering temperatures, roasting time 45～90min;
(7) the shrend stage: insert water quenching pool by the pellet after the roaster roasting and carry out shrend, the aerial time of staying of pellet behind the control roast was less than 15 seconds;
(8) the grind grading stage: the shrend material is carried out ore grinding, cooperate classifying equipoment, control grinding particle size-0.038mm accounts for more than 95%;
(9) the magnetic separation stage: adopt magnetic field intensity H
1The magnetic separator of=0.05～0.10T sorts the thin ore deposit of granularity for-0.038mm, obtains magnetic product I and non-magnetic product I; Adopt magnetic field intensity H
2The magnetic separator of=0.20～0.30T sorts non-magnetic product I and obtains magnetic product II and non-magnetic product I I;
(10) the product dewatered drying stage: magnetic product I is carried out dewatered drying obtain reduced iron powder, magnetic product II is carried out drying and dewatering obtain the smart powder of high purity iron, non-magnetic product I I is carried out drying and dewatering obtain mine tailing.
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| CN102618685B (en) * | 2011-01-26 | 2016-03-09 | 姜洪金 | Burning method iron ore coke-free ironmaking and a cement clinker production technology is ground in energy-conserving and environment-protective two |
| CN102634614B (en) * | 2012-04-16 | 2014-05-07 | 陈小林 | Resourceful treatment method for zinc-containing ironmaking and steelmaking intermediate slag |
| CN102828021B (en) * | 2012-09-24 | 2014-12-03 | 重庆大学 | Phosphosiderite microwave coupling dephosphorization method |
| CN103146911A (en) * | 2013-03-27 | 2013-06-12 | 西南科技大学 | Beneficiation method for treating combined copper oxide ore and recovering associated valuable metals |
| CN105215368A (en) * | 2015-09-23 | 2016-01-06 | 安徽华钢冶金科技有限公司 | A kind of preparation method of reduced iron powder |
| CN105903560B (en) * | 2016-04-13 | 2018-09-14 | 中国地质科学院矿产综合利用研究所 | Deep iron extraction and impurity reduction process for refractory siderite resource |
| CN106238197B (en) * | 2016-08-11 | 2018-08-31 | 李国民 | Copper concentrate produces the roasting-beneficiation method of " copper matte regulus " |
| CN106636521A (en) * | 2016-11-02 | 2017-05-10 | 江苏省冶金设计院有限公司 | Method and system for improving grinding separation effect of reduced pellets containing metal iron |
| CN110170646B (en) * | 2019-07-01 | 2021-08-24 | 重庆有研重冶新材料有限公司 | Superfine iron powder and its production process |
| CN110292989B (en) * | 2019-07-04 | 2021-03-05 | 广东省科学院资源综合利用研究所 | Titanium-iron separation and quality improvement method for seashore sand titanium rough concentrate |
| CN112939050B (en) * | 2021-02-19 | 2023-08-22 | 北京铝能清新环境技术有限公司 | Resource utilization process suitable for semi-dry desulfurization waste ash in electrolytic aluminum industry |
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| Title |
|---|
| 肖军辉等.某鲕状高磷赤、褐铁矿回转窑磁化焙烧试验研究.<<金属矿山>>.2010,(第3期),第43-47页. * |
| 高鹏等.我国复杂难选铁矿直接还原技术的研究现状.<<全国选矿学术会议论文集>>.2009,第25-29页. * |
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